/Engine/Source/Runtime/Engine/Classes/Engine/LevelStreaming.h
Traverses all streaming level objects in the persistent world and in all inner worlds and calls appropriate delegate for streaming objects that refer specified level
static void BroadcastLevelVisibleStatus ( [UWorld](API\Runtime\Engine\Engine\UWorld) * PersistentWorld, [FName](API\Runtime\Core\UObject\FName) LevelPackageName, bool bVisible )